Non-basaltic asteroidal magmatism during the earliest stages of solar system evolution: A view from Antarctic achondrites Graves Nunatak 06128 and 06129

Shearer, C. K.; Burger, P. V.; Neal, C. R.; Sharp, Zachary D.; Spivak-Birndorf, L. J.; Borg, L. E.; Fernandes, V. A.; Papike, J. J.; Karner, J. M.; Wadhwa, M.; Gaffney, Amy M.; Shafer, J. T.; Geissman, J. W.; Atudorei, N.-V.; Herd, Christopher D. K.; Weiss, B. P.; King, P. L.; Crowther, S A; Gilmour, J. D.

doi:10.1016/j.gca.2009.10.029

Cited by 61 publications

(154 citation statements)

References 81 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…The feldspathic meteorite pair GRA 06128/9 has brachinitelike affinities (Day et al, 2009;Shearer et al, 2010;Zeigler et al, 2008), although the official classification remains 'ungrouped achondrite. ' Matsuda et al (2008) calculated 3 He and 21 Ne CRE ages of 0.27-0.46 and 2.9-3.0 Ma, respectively.…”

Section: Brachinitesmentioning

confidence: 99%

Cosmic-Ray Exposure Ages of Meteorites

Herzog

Caffee

2014

Treatise on Geochemistry

153

View full text Add to dashboard Cite

Section: Brachinitesmentioning

confidence: 99%

Cosmic-Ray Exposure Ages of Meteorites

Herzog

Caffee

2014

Treatise on Geochemistry

153

View full text Add to dashboard Cite

“…We also revisit our previously published Ar-Ar data (Shearer et al, 2010), which yield information about evolved components and the halogen chlorine (via 38 Ar) that are complementary to our xenon and iodine data.…”

Section: Introductionmentioning

confidence: 84%

“…We previously analysed xenon in bulk samples of unirradiated GRA 06129 using the RELAX time-of-flight mass spectrometer (Refrigerator Enhanced Laser Analyser for Xenon - Gilmour et al, 1994;Crowther et al, 2008); these results were published in Shearer et al (2010). For continuity we have also used RELAX to analyse bulk samples of irradiated GRA 06129.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…We previously reported xenon and argon analyses of unirradiated fragments of GRA 06129 (Shearer et al, 2010). These results showed the presence of excess 129 Xe ( 129 Xe * ).…”

Section: Introductionmentioning

confidence: 92%

“…Analyses of newly identified ungrouped meteorites are of particular interest as they allow investigations of previously unsampled Solar System processes and environments; among these, the paired meteorites Graves Nunataks 06128 and 06129 (GRA 06128/9) sample an ancient planetary crust. Unlike most achondritic meteorites, which are basaltic in composition, GRA 06128/9 is dominated by Na-rich plagioclase (Shearer et al, 2008(Shearer et al, , 2010(Shearer et al, , 2011Day et al, 2009Day et al, , 2012. Analyses of pyroxene exsolution lamellae have demonstrated that GRA 06129 crystallised within 15-20 m of the surface of its parent body (Mikouchi and Miyamoto, 2008), supporting an origin as felsic crustal material.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Noble gases and halogens in Graves Nunataks 06129: The complex thermal history of a felsic asteroid crust

Claydon

Crowther

Fernandes

et al. 2015

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

The meteorite Graves Nunataks 06128/06129 is a rare example of felsic asteroidal crust. Knowledge of its history can help shed light on the evolution processes of planetesimals. The noble gases can be used to constrain both the chronology of meteorites and the processes that result in movements of volatile elements on asteroidal bodies. We have examined the IXe and Ar-Ar systems of the plagioclase-rich achondrite, Graves Nunataks 06129 by high-resolution laser step-heating of irradiated samples. Iodine and 129 Xe * are both present but are released at different temperatures and do not show a correlation, therefore the I-Xe system in GRA 06129 has no chronological significance. We propose that radiogenic 129 Xe * was lost from primary phases and parentless 129 Xe * was later introduced into the rock by interaction with a fluid sourced from a reservoir that evolved with a high I/Xe ratio. This could have been the same halogen-rich fluid that induced the conversion of merrillite and pyroxene into chlorapatite. Inherited 40 Ar (i.e. not generated by in situ decay of 40 K) is also present in one of three fragments studied here and may have been introduced at the same time as parentless 129 Xe * .

show abstract

Meteorite Misfits

McCoy¹

2014

Special Publications

View full text Add to dashboard Cite

Non-basaltic asteroidal magmatism during the earliest stages of solar system evolution: A view from Antarctic achondrites Graves Nunatak 06128 and 06129

Cited by 61 publications

References 81 publications

Cosmic-Ray Exposure Ages of Meteorites

Cosmic-Ray Exposure Ages of Meteorites

Noble gases and halogens in Graves Nunataks 06129: The complex thermal history of a felsic asteroid crust

Meteorite Misfits

Contact Info

Product

Resources

About